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Adjustable air filtering device
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Patent number 5,364,458
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Issue date Nov 15, 1994
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Dust Free, Inc.
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Gilbert W. Burnett
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B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...
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Dual-dipole electrostatic air filter
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Patent number 4,902,306
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Issue date Feb 20, 1990
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Air Purification Products International, Inc.
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Gilbert W. Burnett
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B03 - SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES O...
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Four-sided air filter
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Patent number 4,749,390
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Issue date Jun 7, 1988
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Air Purification Products, International
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Gilbert W. Burnett
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL